[Fwd: [AMPS] Contemplating Building of First amp]

[Doug Person]

Hi Rich,

> I have a suitable oil filled filter capacitor if u need one.

Yes, thanks very much.
   
> ..........
> >I also note that Svetlana now makes an 812 tube.  Not sure how they
> >compare to 811's, but recall they are a hotter version of the same.
> the 812 is similar, but has a substantially lower Mu.

I was really thinking of the 813.  Don't think Svetlana is making
that, though.


> >I am most interested in the 4CX400A, or perhaps there is another
> >tube even more suitable.  The 4CX400A looks to need 2.5KV at 400ma
> >to deliver 600 Watts (ICAS).  It is certainly more effcient than
> >811's or 572B's.

> doubtful.  Triodes have a lower minimum peak anode v capability than
> tetrodes.

Not doubting you, just confused then.  Consider (From Svetlana's Specs):

	2 x 572B 	4CX400A

PV	   2400		  2500
PI	    500		   400
P in       1200		  1000 
P out       600            610
Eff.        50%            61%			


Tnx,

Doug, W4DXV

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